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A microscopic study of the different classes of symptoms coded by the Vf gene in apple for resistance to scab ( Venturia inaequalis )
Author(s) -
CHEVALIER M.,
LESPINASSE Y.,
RENAUDIN S.
Publication year - 1991
Publication title -
plant pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.928
H-Index - 85
eISSN - 1365-3059
pISSN - 0032-0862
DOI - 10.1111/j.1365-3059.1991.tb02374.x
Subject(s) - venturia inaequalis , biology , apple scab , hybrid , spore , fungus , inoculation , resistance (ecology) , gene , horticulture , botany , rosaceae , genetics , cultivar , agronomy , fungicide
The different symptoms of resistance coded by the VF gene were studied on glasshouse‐grown apple seedlings after inoculation with a conidial suspension of Venturia inaequalis. Scanning‐electron microscopy and histological observations defined precisely three different classes of symptoms. Class 1 corresponds to a hypersensitive reaction. Class 2 is characterized by considerable tissue modifications but no sporulation whatsoever occurs; this reaction defines resistant hybrids. In class 3 the fungus remains active and can sometimes sporulate abundantly; this class was divided into two subgroups, one comprising all the hybrids of weak resistance, the other the hybrids of weak susceptibility.